Calculators
Fast, accurate calculators for everyday math.
Last updated: July 2026
Age Calculator
Calculate exact age in years, months and days from any date of birth — plus total months, weeks and days. Free and instant.
Percentage Calculator
Calculate percentages three ways: X% of a number, what % one number is of another, and percentage increase or decrease. Free and instant.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units and see your weight category instantly. Free and private.
Loan / EMI Calculator
Calculate your monthly loan EMI, total interest and total payment from the loan amount, interest rate and tenure. Free and instant.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, days and total days, weeks and hours. Free and instant.
Tip Calculator
Calculate the tip and total bill, and split it between any number of people. Free, instant tip calculator with custom percentages.
Discount Calculator
Calculate the sale price and how much you save from an original price and a discount percentage. Free and instant.
GPA Calculator
Calculate your GPA from course grades and credit hours on a 4.0 scale. Free, instant, in-browser GPA calculator.
Compound Interest Calculator
Calculate compound interest and final balance from principal, rate, time and compounding frequency. Free, instant compound interest calculator.
Average / Mean Calculator
Calculate the mean, median, sum, count, min and max of a list of numbers. Free, instant average calculator — paste any numbers.
GST / Sales Tax Calculator
Add or remove GST / sales tax from a price at any rate, and see the net, tax and gross amounts. Free, instant calculator.
Time Duration Calculator
Calculate the duration between two times in hours and minutes. Free, instant, in-browser time difference calculator.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin instantly. Free, in-browser temperature converter.
Aspect Ratio Calculator
Calculate a missing width or height that keeps your aspect ratio (16:9, 4:3, etc.). Free, instant aspect ratio calculator.
Calorie / TDEE Calculator
Estimate your daily calorie needs (BMR and TDEE) from age, sex, height, weight and activity level. Free, instant.
Unit Converter
Convert between units of length, weight, temperature, volume, area and speed. Free, instant, in-browser unit converter.
Date Calculator (Add / Subtract Days)
Add or subtract days, weeks, months or years from a date to find the resulting date. Free, instant date calculator.
Markup & Margin Calculator
Calculate selling price, profit, markup % and margin % from cost and price. Free, instant business calculator.
Salary to Hourly Converter
Convert an annual salary to hourly, daily, weekly and monthly pay (and back). Free, instant pay converter.
Dice Roller & Random Picker
Roll virtual dice or pick a random item from a list, using the secure crypto API. Free, instant, in-browser.
Stopwatch & Timer
A free online stopwatch with laps and a countdown timer with an alarm. Runs in your browser, no sign-up.
SIP Calculator
Calculate the future value of a monthly SIP (Systematic Investment Plan) for free — see invested amount, estimated returns and total value.
FD Calculator
Calculate fixed deposit maturity and interest for free — enter amount, rate, term and compounding frequency. Instant and private.
Invoice Generator
Create and download a professional invoice PDF for free. Add line items, tax/GST and your currency (incl. ₹) — built in your browser, no upload, no sign-up.
Which calculators tool should I use?
- Work out a percentage → Percentage Calculator
- Estimate a loan repayment (EMI) → Loan / EMI Calculator
- Project savings with compound interest → Compound Interest Calculator
- Check your BMI → BMI Calculator
- Split a bill and tip → Tip Calculator
About these calculators
Quick, accurate calculators for money, health, dates and everyday math — percentages, discounts, loan EMIs, compound interest, BMI and calories, tips, GPA, age and date differences, and more. Each shows its result instantly as you type, runs in your browser, and stores nothing. Pick a tool above to get started, or browse the full A–Z index.
Frequently asked questions
Are the calculators free and private?
Yes — every calculator is free, needs no sign-up, and runs entirely in your browser.
Should I rely on these for financial or medical decisions?
They're accurate estimates for everyday use, but not a substitute for professional financial or medical advice.
Do results update as I type?
Yes — results recalculate instantly as you change the inputs.